Grinding, polishing, or buffing machine



Dec. 7 1926. 1,609,564

M. LUND GRINDING, POLISHING, OR BUFFNG MACHINE Dec. 7 1926. 1,609,564

M. LUND GRINDING, POLlSHING, OR BUFFING MACHINE Filed Jan. 28, 1924 6Sheets-Sheet/L Mm. MoH/haw Lund.

BJ/CMW/k De@l 7 1926. 1,609,564

M. LUND GRIINDING, POLISHIG, OR BUFFING MACHINE Filed Jan. 28, 1924 sSheets-she@ 5 A mmm lvahew Lund lg'; AWomeSL Dec. 7 1926. 1,609,564

M. LUND GRINDING, POLISHING, OR BUFFING MACHINE Filed Jan, 28, 1924 6Sheets-Sheet "6 lllllllllllllllllll,

- [nuenfor Mm Patented Dee. 7, 1926.

MATTHEW LUND, OF GRAND RAPIDS, MICHIGAN.

GBINDING, POLISHING, 0R BUFFING MACHINE.

Application led January 2B, 1924. YSerial No. 689,015.

This invention relates to rrrinding, polishing or bufiing machines andis particularly directed to novel constructions and combinations whereinquantity production may be attained. The machine designed and which isshown in the a.cco1npanyirigdrawings is for polishing or buing bumperbars of the type used commonly in bumpers for motor vehicles. though itis to be understood that my invention is not limited to the one useshown. It is a primary object and purpose of the present invention tomake` a machine of this character for the rapid polishing, buiiing orgrinding of work, one wherein the polishing, bufiing or grinding Wheelsare mounted in a novel manner so as to automatically follow the workshould the same have any uneven or depressed portions, and one whereinthe lishing,bufiing or grinding wheels are inividuallymounted and drivenand which can be independently moved away from the work and replacedwithout stopping or disturbing the other wheels in operation. A furtherobject. of the invention is to mount the different independent u'nits sothat the same are independently adjustable to different positions aboutachangeable vertical axis whereby the grinding, polishing or buffingwheels have a wide range of adjustment, adapting them to differentwidths of work and to perform work of different characters. A stillfurther Objectis to provide a mounting for the wheels so constructedthat the same are not distorted or otherwise moved out of propr balancewhen mounted in the machine. l any other objects and purposes, includingconstructions whereby the machine may be made to perform its functionsas either a polishing, a buing or a grinding machine effectively, willappear as understanding of the invention is had from the followingdescription, taken in connection with the drawings, pertaining thereto,in which,

Fig. 1 is a front elevation of one end portion of the machine.

Fig. 2 is a like view of the other end portion of the' machine.

Fig. 3 is an enlarged fragmentary plan view of the machine showing oneof the units for polishing or builing in horizontal section. l

Fig. 4 is an enlarged vertical section through the driving means usedfor driving the work carrying conveyer.

Fig. 5 is -a transverse vertical section taken substantially 'on theplane of line 5 5, of Fig. 4.

Fig. 6 is a fragmentary enlarged front elevation, with parts in sectionand broken awa showing one unit of the machine.

Fig. 7 is a fragmentary detail in elevation illustrating the means forlimiting the movement of the polishing, buffing or grinding wheel.

Fig. 8 is al fragmentary vertical section through one of the supportingframes for the machine and the adjustable support for the 'workconveyer.

Fig. 9 is a rear elevation of the construction shown in Fig. 8, and

Fig. 10 is a horizontal section taken through one of the units above thebase plates therefor.

Like reference characters refer to like parts in the different figuresof the drawings.

In the construction of the machine, a plu- .ralityof vertical supportingframes are used,

each including a ront post 1, upper and lower sides 2 and 3 and a rearmember 4, making an open frame, as best shown in Fig.

5. The frames are located in spaced apartA relation and as many used asneed be. Front and rear channel bars 5 and 6 are located horizontallyand parallel to each other on and above the said supporting frames andsecured thereto permanently in any suitable manner.

` Each of the front posts 1 is vertically slotted near its upper end, asindicated at 7, Fig. 8. A bracket 8 is located at the front of each post1, a bolt 9 passing through the slot 7 and through the bracket wherebythe same may be secured in anyplace to which adjusted within the limitsprescribed by the slot. Two channel bars 10 and 11 are positioned overallof the brackets 8in spaced apart parallel relation and are secured tosaid brackets. The flanges of 'the channel bars extend toward each otherand on the upper ianges, plates 12 are secured to serve as tracks forthe work carrying carriages to run over, there being a continuous slot13 between thef inner edges of the plates 12, as shown. A channel bar 14is located between the channels 10 and' 11, being positionedhorizontally. This channel bar 14 terminates at its ends a distanceshort of the ends of the channels 10 and 11.

A rack bar 15 is permanently secured at its upper end to each lbracket8, extending downwardly therefrom and seated in a vertical slot orgroove made in the front side of each post l. The rack meshes with apinion 16 fastened at the front end of a short shaft I7 passing throughand rotatably mounted in the post 1, at its rear end carrying a wormgear 18. Each of the worm gears engages and is driven by a worm 19, allof which are mounted on a common shaft 20 located horizontally andmounted in bearings 2l secured at the rear sides and near the lower endsoi the posts 1. This shaft extends the full length of the machine. Atone end (see Fig. l), a sprocket wheel 22 is fastened to the shaft 20,around which an endless chain 23 passes, it also passing around a secondsprocket wheel 24 mounted at the ends of the channels 5 and 6 which isadapted to be turned manually by means of a crank 25. It

is evident that on loosening all of the bolts 9 and turning crank 25,all of the brackets 8 may be simultaneously raised or lowered to adesired position and the channel bars 1.0 and 11 and the mechanismcarried thereby are raised or lowered with the brackets. lVhen a desiredposition is reached, the bolts 9 are tightened to hold the position towhich adjusted.

A distance in from an end of the channel bars 10 and 11 a relativelylarge sprocket wheel 26 is located, being mounted on a shaft 27 carriedin bearings at the lower portions of plates 28 and 29 secured to thechannel bars 10 and 11, respectively. This sprocket wheel extendsupwardly between the channel bars 10 and 11 at a point beyond the end ofthe channel bar 14. A relatively heavy chain 32 passes around the wheel26 and also around a second similar wheel 30 mounted adjacent theopposite. end of the machine on a shaft 27 carried on brackets 28a'adjustably ixed on the channel bars 10 and 11 and held in adjustedposition by bolts after being adjusted by the adjusting screw 31, asshown in Fig. 1. Chain 32 at intervals is provided with outwardlyextending pintles on which rollers 33 are mounted, which rollers areadapted to traverse the channel bar 14 as a supporting track therefor.And said chain at wider intervals is provided with links from which lugs34 project, projecting up-l wardly in the upper run of the chain anddownwardly in the lower run.

A gearing housing 35 is carried on the rear side of the post 1 at theend of the machine where the sprocket wheel 26 is located in which twoshafts 36 and 37 are mounted horizontallv in parallel relation. Threegears 3S of different sizes are keyed t0 the lower shaft 36 and ashiftable sleeve 39 having three different sizes of pinions thereon ismounted on the shaft 37 to be shifted to any one of three differentpositions so that one of the pinions will mesh with a gear 38 in each ofthe three dierent positions. A yoke 40 embraces the sleeveand isattached to a shiftable bar 41 at the up er side of the housing 35whereby the shi ting may be accomplished. Pulley 42 is fixed on au endof the shaft 37 and may be driven by belt 43 from any suitable source ofpower.

In alinement with the shaft 36 is a shaft 44 connected thereto whichpasses into a housing 45. lVithin said housing the shaft, 44 is equippedwith aworm 46 which engages and drives a worm wheel 47 secured to a hub48 which is rotatably mounted in the housing and through which avertical shaft 4f) passes, said shaft being keyed to the hub 48 butvertically movable therethrough. The housing and mechanism therein issupported by the arm 50 attached to the post 1 and by a leg 51, as shownin Fig. 4.

At its upper end above the housing 45, shaft 49 has attachment to ashaft 52 in ver tical alinement therewith which is rotatably mounted ina housing 53 connected to the channel 11 and movable up and down there.-with. A worm 54 is carried on shaft 52 within the housing 53 and engageswith a worm wheel 55 which is attached to the head 56 of a sleeve F6aloosely mounted on shaft 27. as shown in Fig. 5. A clutch member 57 issplined on the end of the shaft 27 and it and the head 56 are formedwith coacting dog clutch teeth 58 for interengagement whereby the shaft27 is driven by the shaft 52 when the clutch is engaged but may be freeand remain at rest when the clutch is disengaged. Normally the clutch isin engagement. but if desired at any time, the movement of the chain 32and work carried thereby may be stopped without cutting ofin the powerby moving clutch member 57 to the rear.

Individual carriers for the work to be acted upon by the machine areprovided to move over the track plates 12. These carriers include twomembers 59 equipped with rollers 60 to run on the plates 12 and havinf.rlugs 61 projecting downwardly through the slot 13 in position to beengaged by the lugs l34 on the chain 32. The two members 59 are locatedin spaced apart relation. Each has a lug projecting upwardly to which avertical plate 62 is permanently attached, at the upper edge of which ahorizontal ledge 63 is turned and on which the work, in the presentcase, a bumper bar 64 is laid. At the ends, the bumper bar 64 may besecured by clamps 65 to the vertical plate 62. It is of course apparentthat the carriage for carrying the work may be designed for anyparticular character of work and the one shown is for illustrativepurposes only and not in any sense to be considered the only type ofwork carriage that can be used.

These work carrying carriages have the bumper bars attached thereto andare then placed on the track plates 12 at one end of the machine, a lug34 on the chain 32 engaging with the first of the members 59 whereby thecarriage with its attached bumper is moved lengthwise of the machineover thechannel bars 10 and 11 until the chain'changes directionv inpassing around the wheel 26. When this occurs, lug 34 disengages fromthe member 59 and the carriage is at the opposite end of the machine. Itmay be removed therefrom, its 'bumper bar released, and the carriagereturned to the entrance end of the machine to receive another bumperbar. During its passage lengthwise of the machine the bumper bar isbufed, polished or ground; the mechanism for acco-mplishing the samewill now be described.

The grinding and olishing or bufiing is done by a plurality o grindingand polishing or bufiing'wheels, each of 'which is designed to beoperated as a unit and is adjustably mounted on the machine as anindependently placed and driven unit. A description of one of theseunits will sufiice for all. In the construction, a base plate 66 ofrectangular form is located above and bears against the upper anges ofthe channels 5 and 6 and is secured wherever desired in the length ofthe channels by releasable clips 67 engaging with the under sides of theupper flanges of said channels 5 and 6. Plate 66 is formed with atransverse slot 68 therein (see Fig. 10). A- second plate 69 is locatedover the plate 66 and has a slot 7 0 therein ositioned to cross the slot68, a bolt 71 passlng through both slots. This permits a considerablerange of adjustmentof the plate 69 with reference .to plate 66,

-either transversely of the machine or longitudinally, and plate 69 maytake any desired angular position with respect to plate 66. Two spacedapart upright posts 72 extend upwardly, one at each side of the j plate69 and at one end two spaced apart ears 73 are cast and extend upwardly.

Alined openings are made through the posts 72 near their upper ends inwhich sleeves 73 are mounted, at their outer ends being formed each withan annular flange 74.

Enlarged housings 75 are formed between.

the ends of each of the sides 76 and 77 of a frame, through which saidsleeves are passed in mounting the same in the posts 72, the flanges 74seating in the bottoms of the recesses made in sald housings. The frameis completed by a cross bar 7 8 connecting the sides 76 and' 77 adjacentone end .thereof and by a cylindrical cross member 79 integral with andconnecting the opposite ends of said sides. Cup-shaped members 80 and 81are threaded into the recesses in said housings 75 closing the same andserving as supports for bearings for a shaft 82 which passes through thesleeves73, the bearings forthe shaft being locatedwithin the cups 83shown.

One end of the shaft 82 is reduced in size, as indicated at 82, extendsbeyond the adjacent side 76 of the frame and through the bottom of themember 80, being equipped with' a pulley or wheel 84. Shaft 82 isadapted to be driven by a belt assed around the pulley 85 fixed to the siaft between posts 72. Each pulley 85 has an individual belt 86 to driveit in each of the units.

A link belt 87 passes around the pulley or wheel 84 and also around asecond pulley or wheel88 fixed 011 the reduced end portion 89 ot a shaft89 which passes through the cylindrical cross member 79, being mounted1n bearings contained in the cups 9() which in4 89- is formed with athreaded section 89b on to which a plate 93 is threaded, at one sidehaving a projecting ear in which an opening 94 is made therethrough (seeFig. 6). A pin 95 is secured to the plate 93Vand projects therefrom soas to enter an opening made therefor on an enlarged flange 96 at theinner end of a sleeve 97 which is ada ted to be laced over an extension89c of siaft 89. he sleeve is detachably held in place by a Washer 98which comes against the outer end of the sleeve and a nut 99 threaded onto the end of the shaft section 89C. The wheel used forpolishing,indicated at 100, is carried on and around the sleeve 97. In manyinstances, lparticularl in bufiing wheels, the body 100 of the W eel isof canvas and the same is subject to compression in many cases in itsattachment to the spindle or shaft on which it is mounted, with adistortion and destruction of the balance of the wheel which should bemaintained as the wheels travel at a high rate of speed. With thisconstruction, with the wheel body carried on the sleeve and driven bythe driving stud 95, and the attachment of the Wheel so that noattaching pressure of the nut 99 and washer 98 comes thereagainst nochange of the wheel balance is caused.

It will be noted that the frame that carries the grinding, polishing orbufiing wheels is mounted to tilt on the supports 72 through therotatable mounting of the sleeves 73 in said supports, the said sleevesbeing secured to the sides 76 and 77 in fixed relation by the pressureof' the members 80 and 81 theref against. The frame does not turn ortilt on the shaft 82 but thesleeves 73 serve as trunnions torthe tiltingot the frame in the supporting posts 72. The shaft 82 runs freely andhas no actual bearing in the sleeves 73, the bearings being ofanti-friction character housed within the cup members 83. This avoidswear of the shaft in the sleeves 73 and permits a high speed of shaft 82without vibration.

Two spaced apart lugs 101 project from the cross bar 78 of the frame andthe ends of the sides 76 and 77 of said frame are formed with bearings102 having openings in alinexnentl with like openings 1n the lugs 101. Ashaft is mounted for rockin@ movements through said lugs and one of thebearings 102 and has a handle 104 attached thereto for manual operation.An arm 105 is fixed to shaft 103 between the lugs and to this arm theupper end of a curved bar 106 is pivotally connected, the lower endthereof being pirotally connected to and located between the ears 73a onthe plate 69. It is evident. that by operating the handle 104, thetilting frame maybe moved to two differcnt extreme positions, in one ofwhich. as shown in Fig. 6, the wheel 100 is lowered to operativeposition, and in the other of which, as shown in one place in both Figs.1 and 2, the wheel 100 is lifted to inoperative position. lVhen theframe is thus tilted, the curved bar 106 serves as an automatic lock tohold the wheel 100 elevated, the concaved or recessed side of the barallowing the upper end thereof to pass over the axis of the shaft 103 toperform said retaining or locking function. Each unit beingindependently driven and manually operated to inoperative position. itis evident that the machine as a whole does not need to be stopped anytime that a wheel 100 is to be removed and replaced by another, theproduction of machine continuing at all times. In fact it is designedthat enough units shall be used that two or more of them may at alltimes be left in inoperative position to serve as a supply when any unitthat is in operation needs attention such as repair, replacement of thewheel 100 or otherwise.

A limit stop means is used to limit the downward movement of the wheel100. It consists in a link 107 connected at its lower end with the pivotpassing through the ears 73n and the bar 106, said link being lonitudinally slotted, as at 10S, whereby t e upper end of the link isprovided with a cross section 109 through which an adjusting screw 110may be threaded. The shaft 103 passes through the slot 108 and comesagainst the lower end of the screw 110 when the wheell 100 is lowered tooperative position, it being evident that the wheel 100 can be loweredonly to the point where the shaft 103 engages against the screw 110.

The weight of the wheel 100 and the mechansm at the end of the framewhere it is mounted is counterbalanced partly. A plate 111 is attachedat the upper end of one of the posts 72 and has upwardly projecting earsto which a lever 113 is pivotally mounted between its ends. On the freeend portion of the lever a weight 114 is adjustably mounted and theopposite end of the lever is connected with the side 76 of the frame bya link 115. This serves as a counterbalance construction though it is tobe understood that the weight of the wheel 'balanced as the wheel has tobear with some pressure against the bars 64 in operating thereon.

The bars 64 move slowly from one end of the machine to the other beingacted upon by a relatively large number of grinding and polishing wheelsduring the movement. At the initiation of the grinding and polishingprocess, the coarser wheels are used and the change to the finestpolishing wheels at the other end of the machine is gradual. The wheelsbeing carried by freely tilting frames follow the surfaces of the barsland grind and polish the same, even to part of the curved end portionsthereof. The wheels 100 may he set at different angles and this isdesirable in order that scratches in the surfaces of the bars 64 made byone wheel shall be practically removed by the succeeding wheel whichrotates against the bumper bar surfaces at a different angle. Theadjustnient provided by the slots in the plates 66 and 69 with thcsecuring bolt 71 passing therethrough permits this and the adjustmentfor each unit is independent of any other unit.

In grinding and polishing metal, all of the wheels 100 rotate in thesame direction and the grinding and polishing may be done completelywith the movement of the work through the machine. Buiiing is done withdifferent wheels and with a rotation of the wheels in the oppositedirection. According-ly, a separate machine should be provided forbuHing having identically the same construction as the one outlinedabove but with the frames carrying the buffing wheels reversed inposition. This is done by removing each frame from its supporting posts72, turning it over so that the wheels will be on the opposite sides ofsaid posts and then remounting the same. The construction used formounting the frames permits this or the initial assembly in such mannerso that for either buiiing or for grinding and polishing the machine inits elements does not have to be changed, merely being differentlyassembled.

The lugs 34 on the conveyor chain may be placed any desired distanceapart so that the bars 64 may follow one another closely or be fartherapart as may be required to permit cooling of the bars during theoperations thereon, considerable heat being generated during theoperations. As an additional cooling safeguard, a pipe 116 may belocated between the channel bar 5 and the work carrying carriages, beingsupported by supports 117 attached to the channel bar 5 and havingopenings in its outer side through which compressed air forced into thepipe escapes and is blown across the bars 64 to aid in cooling the same.

The machine described is very practical and elicient for the purposes ofsecuring quant-ity product-ion 1n certain classes of work. The freetilting movement of the frames which carry the grinding, polishing orbuiling wheels, permitting the Wheels to follow the work; theindependent mounting, driving, and operation of each unit to eitheroperative or inoperative position; the simultaneous elevation ordepression of all of the supports for the work carrying conveyor toelevate or lower the same in accordance with the character of work to bedone, for diercnt diameters of the grinding or polishing orbuiiingwheels; and the independent adjustment of the said wheels to'difierentan.n guiar positions all combine to make the machine one of greatpractical value, which has been demonstrated in actual practice. Theinvention is defined in the appended claims and is to `be considered ascomprehending all forms of structure coming within their scope.

I claim:

l. In a machine of the class described, the combination of ahorizontally located elongated support, a pluralit)T of individual unitsconnected to and located above the support in spaced apart relation,each of said units including a rigid supportin element, a framepivotally mounted on sai element to turn about a horizontal axis, aspindle mounted at one end of the frame, and a wheel mounted on thespindle normally tending to drop by gravity, an elongated supportinrmeans positioned horizontally below all of said wheels, means forraising and lowering said supporting means, work holding devices adaptedto move over the supporting means, means mounted on said supportingmeans adapted to detachably engage said devices to move the same, meanstor driving said moving means and means for driving said spindles.

2. In a machine of the class described, a horizontally located elongatedsupport, 'a plurality of individual units located 1n spaced apartrelation above the support, each of said units including a base plateprovided with a transverse slot therein and adjustably connected to thesupport to be located in different positions engthwise thereof, a secondplate located against the upper Side ot' the base plate and formed witha slot therein crossing the slot in the base plate, a pair of spacedapart posts projecting upwardly from the second plate, a frame mountedon the posts to turn about a horizontal axis, a spindle at one end ofthe frame, a wheel on one end of the spindle, said vwheel normali:dropping by gravity, a boltpassing through the slots in the. base andsecond plates, and means for moving work to be acted upon by said wheelsunder the same, substantially as described.

3. In a machine of the class described,

a spindle mounted in one end of the frame, a wheel attached to one endof the spindle,

a shaft mounted to turn about an axis coincident with the pivotal axisof the frame, means `for driving the shaft, means for driving thespindle from the shaft, means for limiting the downward movement of thewheel and the end of the frame at which it is mounted, means for partlcounterbalancing the weight of ther whee and manually operable means fortiltin the frame to elevate the wheel and hol it in elevated posltion.

4. In a machine of the class described, a unit comprising a base plate,a second plate mountedl on and above the base plate to turn about avertical axis, two posts projecting upwardly from the second plate, aframe mounted between its ends to turn on a horizontal axis on theposts, a spindle rotatably mounted at one end of the frame, a wheelattached at one end of the spindle, a shaft carried by the frame androtatable about an axis coincident with the pivotal axis of the frame,means to drive the shaft. means to drive the spindle from the shaft, andmanually operable means disposed between the opposite end of the frameand the second plate for elevating the wheel and the end of the frame atwhich it is mounted and for holding it in elevated position.

5. In a machine of the class described, a unit comprising a base plate,a second plate mounted on and above ,the base plate to turn about avertical axis, twc posts projecting upwardly from the second plate,aframe pivotally mounted between its ends on the posts to turn about ahorizontal axis, a spindle rotatably mounted at one end of the frame, awheel on the spindle, a shaft carried b the frame and rotatable on anaxis coinci ent with the, pivotal axis of the frame, means to drive theshaft, means to drive the spindle by the shaft, a short shaft rotatablymounted at the opposite end of the frame, a handle attached thereto formanually rocking said short shaft, an arm projecting from said shortshaft, and a link pivotally connected at its upper end to said 4 arm andat its lower end to the second plate,

said link being curved with its concave side located toward the frame,substantially as and for the purposes described.

6. In a machine of the class described` a unit comprising a base plate,a second plate mounted on and above the base plate and adjustable abouta vertical axis, two posts projecting upwardly from the second plate, aframe having spaced apart sides with a cross bar connecting the same atone end anda hollow cylindrical member connecting them at the other endlocated adjacent the upper ends of the posts, each of said sides beingformed with enlarged portions between their ends recessed from theirouter sides inwardly, sleeves having flanges lat their outer endspassing through the said sides of the frame into the posts with the"flanges thereof seated in the bottoms of said recesses, cup-likeretaining members screwed into said recesses against said flanges, ashaft passing through the said sleeves and having bearings thereformounted in the cup-like members, a spindle mounted through saidcylindrical member of the frame, means to drive the shaft. means todrive the spindle from the shaft, and a wheel attached to one end ot thespindle.

7. A construction containing the elements in combination defined inclaim 6, combined with means for partly balancing the end ot' the frameat which the wheel and spindle are mounted, and means for manuallyelevating said end of the. frame.

8. In a, machine of the class described, an elongated support comprisingtwo channel members paralleling each other, a plurality of units locatedover said elongated support, means for detachably connecting each of theunits independently to said channel members, each of said unitsincluding a wheel adapted to grind, polish or buff work and mounted forup and down movements, normally dropping by gravity, vertical supportingmembers carrying the said elongated support, said vertical members beinglocated in spaced apart relation to each other, a bracket carried oneach of the vertical members at the front thereof, means forsimultaneously raising or lowering said brackets, two channel memberslocated in spaced apart parallel relation on said brackets, an endlessconveyer chain mounted on the channel members whereby the upper run ofthe chain passes longitudinally of and between the channel members,means to drive the chain, lugs extending from the chain at spaced apartintervals, work carrying carriages adapted to traverse the last namedchannel members lengthwise thereof, said carriages having lugsprojecting downwardly therefrom between the channel members to beengaged by the lugs on the chain to move the said carriages under saidwheels, substantially as described.

9. In a machine of the class described, a plurality of spaced apartvertical supports, an elongated support located over the verti` calsupports and attached thereto, a bracket mounted on the front side ofeach of the vertical supports, two channel members 1ocated in spacedapart parallel relation on and attached to said brackets, a thirdchannel member located between the two channel members part of thelength thereof, said last named channel being located with its webhorizontal, sprocket wheels mounted on the two channels, a sprocketchain around the wheels, the upper run thereof riding on the thirdchannel, means to drive one ot the sprocket wheels, work carryingdevices adapted to traverse the upper sides of said two channels, lugson the chain and on said devices engaging to move the said devices bythe chain, and means mounted on the elongated support to act on the workcarried by said work carrying devices.

10. In a machine of the class described, a plurality of spaced apartvertical sup` ports, an elongated support located over the verticalsupports and attached thereto,

'a bracket at the front side of each vertical support, a rack barattached to and depending from each bracket, a pinion meshing with eachrack bar, means for simultaneously turning all of the pinions, devicesfor releasably securing the brackets to the vertical supports, spacedapart channels located over all of the brackets and attached thereto,work holding devices adapted to travel lengthwise ot' the channels,means for moving said work holding devices lengthwise of the channels,and means mounted on the elongated support to act on the work carried bysaid devices.

ll. In a machine of the class described, a plurality of units, locatedin longitudinal alignment, supporting means therefor, each otl saidunits having means for attachment of a grinding, polishing or builingwheel, means for driving each of said wheels independently, means forindependently adjusting each of said wheels to a desired position withreference to the work, means for carrying the work to and by saidwheels, and means for manually moving any wheel to an inoperativeposition with reference to the work.

12. In a machine of the class described, a spindle, a plate attachedthereto adjacent one end thereof, a sleeve formed at one end with anenlarged outwardly extending flange to bear against the plate, saidflange and plate having readily disengageable driving engagement, awheel body adapted to be placed over the sleeve, and means detachablyconnected to the end of the spindle to bear against the end of thesleeve to hold it on the spindle without affecting the body of thewheel.

In testimony'whereof I alliX my signature.

MATTHEW LUN D.

